Mechanism for an office chair



FIG. 1 is a bottom perspective view of the mechanism for an office chair, showing my new design;

FIG. 2 is a side elevation view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a front elevation view thereof;

FIG. 6 is a bottom perspective view thereof, showing the mechanism in the context of an office chair, the unclaimed subject matter being drawn in broken lines;

FIG. 7 is a side elevation view thereof; and,

FIG. 8 is front elevation view thereof.

The subject matter illustrated in broken lines forms no part of the claimed design. 

CLAIM The ornamental design for a mechanism for an office chair, as shown and described. 